Reverse Engineering Fusion

Problem

Many reverse-engineering efforts stop at copying visible behavior: reusing snippets, imitating the UI, and testing only happy paths. When the upstream version changes, the result breaks, and the team cannot reuse the work. The gap is not code, but a stable abstraction from observed behavior to protocol, architecture, and maintainable documentation.

How It Works

The skill organizes reverse engineering with the ORRI method:

• Observation: inspect structure, entry points, configuration, input/output, boundary conditions, and error handling without modifying the target.
• Reverse: infer internal structure from behavior, extracting XML/JSON/binary protocol formats, data flows, control flows, key functions, and modules.
• Reconstruct: reimplement with your own stack, starting with protocol compatibility, then data conversion and business logic, and add unit tests.
• Innovate: fix known issues, extend features, and integrate the result into your own system.

It also requires outputs such as protocol.md, architecture.md, implementation.md, and maintenance.md, with an acceptance checklist to avoid line-by-line copying, missing edge cases, and undocumented decisions.

Boundaries

It is useful for system integration, protocol adaptation, long-term maintenance, and autonomous reconstruction where compatibility and ownership matter. It does not provide legal authorization, guarantee full replication of protected systems, or cover privacy compliance for closed-source products.